Reenforced concrete pile



F. S. SNOW 'ET AL REENFORCED CONCRETE PILE Aug. 13, `1935.

Filed Jan. 4, 1935 lll lill III1|| A i., Wr,

y Patented Aug. 13, `1935 .naar OFFICE REENFORCED CONCRETE PILE Frederick Sidney Snow and Percival William Hawkins, London, England Application January 4, 193e, serial No. 650,198 In GreatBritain February 25, 1932 10 Claims.

This invention relates to concrete and like piles and has for its objectito provide an improved construction of pile, which is particularly applicable where head-room for driving is limited.

Concrete piles are of two main classes, namely precast piles which are hardened before driving and in situpiles which are formed by driving a hollow shell into the ground and lling ythe shell with concrete as the former is withdrawn. v With both types of pile as ordinarily constructed, the driving frame has to have suliicient head-room to commence driving when the whole length ofthe pile is above the ground.

One typeof pile has been proposed in which successive short lengths of hollow concrete tubes are driven into the ground to the requisite depth, one tube abutting 'its'neighboun and the hollow space is afterwards iilled withv concrete. This type of construction enables driving to be carried out with smaller: head-room than vwith the ordinary precast pile, but `presents difficulty in ensuring absolute straightnessof the pile and a tight joint between successive lengths;

One object of the invention is to provide a precast reenforced'concrete impact driven pile com-y prising in combination a plurality of precast units each of comparatively short length provided with inter-engaging extensions and recesses to form a substantially solid pile.

Another object of the invention is to'provide a precastreenforced concrete pile comprising a bottom pointed member provided with a deep recess in the top thereof and an upper member provided with a spigot engaging said recess the junction of the spigot and main portion of the upper member forming a Aledge tting over the lower f member and transmitting the driving impact thereto.

With these and other objects in view the invention consists in the improved vconstructions of pile hereinafter described in detail and set out in rthe claims which follow.

In one preferred form of pile each unit, with the exception of the top and bottom lengths, is formed at one end with a recess, at the other end with an extension, and a shoulder at the top of It will be seen that with the construction above referred to driving Ycan continue almost yirnmedia-tely after each lengthening piece has been placed in position becausethe shoulder of` the lengthening piece bearingv against the top edge of the lower length gives the necessary bearing to transmit the impact.

In order that the nature of the invention may be more fully understood forms of pile lin accordance with itwill now be described by wayof example with reference to the following drawing in whichzf- Fig. 1 represents a longitudinal section through the bottom and` next higher units of one form of pile constructed in accordance with the in.

vention, l f, l

Fig. 2 is a cross-section on the line ,'2-2 Aof Fig. 1,. n n

Fig, Brepresents diagrammatically a longi tudinal sectional view of a composite pile made up of a plurality of interengaged units. f

Referring to Fig.`1, a base unit A is formed. as a rectangular beam hollow for most of its length and having a lower shoe portion B. 4The next higher unit T consists of v. an upper-rectangularl hollow portion C of the same external cross-section dimensions as those of the base unit A; a solid portion D, the shoulders E ci which bear on the top of the base A, and a solid extension F which lits into the hollow portion of the base A, which hollow portion is `or" very slightly larger dimensions than the extension F. Suitable reenforcements are provided in both units, which consist of continuous longitudinal barsG, bent in the solid portion D of the upper unit, and spiral transverse lacing H.

The internal dimensions of the hollow portion C of the upper unit are the same as those of the hollow portion of the base A in order to receive the extended portion of a further unit of the same shape as the unit T.

The solid extension F of the upper unit T is provided with grooves J (Fig. 2) whichactas channels for cement grout X which may be poured into the hollow portion of the shell A after driving it, and before or simultaneously with the inq as the units T except that its upper part is solid instead of being formed with a recess, and furthermore the length of its upper partlneed not necessarily be the same length as the upper parts of vthe units T. Thus, the length of the upper part of the unit Y may be shorter or longer or equal to the lengths of the upper parts of the units T, depending upon the ultimate length of 1. A precast reenforced concrete impact-driven pile comprising in combination a bottom pointed member provided with a deep central recess and an upper member provided'with a long spigot tting within said recess, the junction with said spigot and the body of said upper member forming arshoulder engaging with the upper Vsurface of said lower member. l l

' 2. A precast reenforced concrete impact-driven pile comprising in combination a bottom pointed member provided with a. deep central recess and an upper member provided with a long Yspigot tting within'said recess and an upper deep cen-A tral recess, thejunction with said spigotand theY bodyof said uppermember forming a shoulder engaging with the upper surface ofsaid lower n member.

,3.,A precast reenforced concrete unitfor an Y impact-driven pile having a deep recess at the upper endV and a deep spigot at the lower end thereof, therecess and Vspigot Vbeing of sub-V stantially the same dimensions and their depth being not less than three times their lateral dimensions. Y n

4. A precast reenforced concrete impact-driven pile comprising'in combination a plurality of precast units each of comparatively short length providedwith inter-engaging recesses `and solid spigots to form, by their interengagement, va substantially solid pile. Y

5. A precast reenforced concrete impact-driven pile comprising in combination a bottom pointed member provided Awitha deep central recss and ya' plurality of intertting upper membersjeach provided with alower long spigot and an upper deep central recess, each spigothaving at least those of the recess in the lower member,.the

spigot iitting in the recess, and cement grout positioned in the clearance space between said spigot and said recess. Y

7. A precast reenforced concrete unit for an fimpact-driven pile having a deep recess atvthe upper end and a deep spigot at the lower end thereof, and .reenforcing means running sub,- stantially throughout the length of saidj unit including said spigot and comprising a plurality of longitudinal bars boundby transverserlacing;

8.V A prec-ast l,reenforced concrete unit Yforan impact-driven pile having a deep recess atthe upper endgthereof. and a deep spigot at the lower end thereof and ashoulder at the top of said spigot. s 9. A precast reenforced concrete impact-driven pile comprising in combination a bottom pointed member provided with a deep centralrecess, and i with reenforcement throughout substantially the whole length of said member, and an upper mem-V said recess and an upper deep central recess, said ment throughout substantially its 'whole length,A

l andthe junction with said spigot and the body of said upper member forming-'a shoulder engaging with the'upper'surface' of Said lower member.

l0. Aprecastreenforced concrete unit for Van impact-driven pile having avdeep recess at vthe' uppenend andardeep spigot at jthe lower end thereof, and a shoulder at the top of th'e'fspigot,

the depth of said recess being slightlyrgreater than thelength of said spigot. A C FREDERICK SIDNEY SNOW.l

PERCIvAL WILLIAM HAWIjzINs. f V 7.

ber provided with aV long spigot fitting within si upper member Vbeing vprovided*v withl reenforce- 

